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Academic Commons Search Resultsen-usMicroalgae Preconcentration by Sedimentation and by Addition of Montmorillonite Clay Coagulanthttp://academiccommons.columbia.edu/catalog/ac:156640
Murray, Elizabeth Theresehttp://hdl.handle.net/10022/AC:P:19060Thu, 14 Feb 2013 00:00:00 +0000There is great interest in the use of microalgae as a feedstock for biofuels, potentially allowing for the development of a sustainable fuel source to replace existing use of petroleum-based fuels. While microalgae is easily grown, it is energy intensive to harvest because it grows at concentrations as low as 0.01%. Centrifugation can concentrate the microalgae to a useable 10-15%, but has a high energy cost. “Preconcentration” methods, particularly gravity sedimentation with or without the addition of a coagulant, are promising as they may achieve a microalgae concentration of 2-3% at a lower cost. The combination of preconcentration methods with centrifugation may bring the energy cost down enough to make the production process economically viable. Here, the efficiency (percent of microalgae that is removed from the water) of a microalgae sedimentation tank was tested at flow rates of 50-680 mL/minute, along with the microalgae concentration that each flow rate produced. In a separate jar test, montmorillonite clay was added to aid in coagulation of the microalgae by neutralizing the negative surface charge of the individual particles. Findings show that increasing the sedimentation flow rate decreases the efficiency but increases the concentration of microalgae produced. Additionally, an optimal coagulant dosage of 150 mg/L was established for montmorillonite clay.Chemical engineering, Organic chemistry, Alternative energyetm2116Chemical EngineeringPresentationsSonic Therapeutic Intervention: A Better Medicine for the Futurehttp://academiccommons.columbia.edu/catalog/ac:143106
Kulkarni, Shruti Gopalhttp://hdl.handle.net/10022/AC:P:12137Mon, 09 Jan 2012 00:00:00 +0000Sonic Therapeutic Intervention (STI) is, in essence, a method of healing and self-improvement based on the regular administration of particular sound vibrations. Based on the fundamental principle that various types of sounds have particular effects on the mind and body, Sonic Therapeutic Intervention seeks to take advantage of those sounds that are most beneficial to the mind, in order to create various positive effects — including decreased anger and anxiety, more developed cognitive function, improved decision-making ability, and increased self-control. With regular practice, Sonic Therapeutic Intervention is effectively able to enact these beneficial effects, thus destroying the root causes of a variety of social and psychological problems.Alternative medicinesgk2118Chemical EngineeringPresentations